>first you may have a photo from the solder stop layer as well,

The solder mask was often done by having a master with the pads on and 
producing a defocused photo of it, and the amount of out of focus enlarged 
the pad size sufficient for the solder mask.

This was easy to do when doing double sided PCBs, as the master could be 
exposed in a colour that showed only the black pads, and ignored the red and 
blue tapes.

However from the ongoing discussion from the OP, it sounds like his client 
wants to manufacture some PCbs to use as spares in machine repair, so the 
number of boards is limited and I wouldn't worry about a solder mask - but 
is the original PCB does have a solder mask, I guess it could be recovered 
photographically before polishing it off. 

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